| 摘要 |
PROBLEM TO BE SOLVED: To avoid unnecessary NAPT executions.SOLUTION: In a network system 100, a communication apparatus 10a on a calling side transmits/receives control information for call control to/from a communication apparatus 10b on an incoming side through P-CSCFs 20a, 20b. Moreover, the communication apparatus 10a on the calling side transmits/receives user data to/from the communication apparatus 10b on the incoming side through IMS-AGWs 30a, 30b. A NAPT execution determination unit 22 of a P-CSCF 20 extracts connection destination included in the received call, inquires an ENUM/HSS 40 about the connection destination, and determines whether or not NAPT is executed on the basis of information on the connection destination which is acquired by the ENUM/HSS 40. When determining that NAPT is to be executed, the NAPT execution determination unit 22 transmits instruction information indicating NAPT execution instruction to an IMS-AGW 30. When receiving the instruction information, a NAPT processing unit 32 of the IMS-AGW 30 executes NAPT. |
